Tongs



M. GLAS June 17, 1941.

TONGS Filed July 16, 1937 6 Sheets-Sheetl Rm NM QM w GLAS June 17, 1941.

TONGS' Filed July 16, 1.937 6 Sheets-Sheet 2 wmv INVENTOR 6 LAs MAu RusA J Y B M. GLAS June 17, 1941.

TONGS heats-Sheet 3 INVENTOR MA URUS GLJAS Arrow [vs Filed July 16, 1937gmw M. GLAS June 17; 1941.

TONGS Filed July 16, 1937 6 Sheets-Sheet 4 INVENTOR MAuRus GLAS By W,

ATT RNEYS M.GLAS

June 17, 1941.

TONGS Filed July 16, 1957 6 Sheets-Sheet 5 N h N E eniol:

Maw/'00" 6Z1:

M. GLAS 2,245,856

TONGS Filed July 16, 1937 e Sheets-Sheet e iizvemi-or; Maw-us 6 Z wPatented June 17, 1941 FFICE TONGS Maurus Glas,Schmalkalden-Naherstille, Germany Application July 16, 1937, Serial No.154,113 In Germany July 17, 1936 8 Claims.

This invention relates to combination riveting tongs and punch plierswhich may be utilized in riveting, perforating, punching, spot weldingand the like.

According to the invention, the combination comprises a tool and acounter tool, a rod for causing the tool and the counter tool to drawnearer to or away from each other, movable means for moving the rod, andmeans which permit the tool and the counter tool to draw nearer to oraway from each other without moving the means for moving the rod. Tomove the tool or counter tool or both the handles of the tongs needtherefore to be compressed only for the actual pressing work, while theapplication of the tongs and the approach of the tool or counter tool tothe work do not require any motion of the legs of the tongs, so that theentire travel of the legs can be utilized for actual work and afavorable conversion of energy obtained.

The combination tongs'are so constructed that the rod moving the tool orcounter tool is guided in a tube at one end of which the tool andcounter tool are provided. This tube serves as leg, and a second leg isarticulated to a part disposed in the tube.

The invention further contemplates the formation of the tongs so that itis convenient to handle and the center of gravity thereof is as much aspossible located in one hand. For this reason the second leg isarticulated to the end of the tube that is opposite to the tool andcounter tool, and the second leg can be turned 360 about the axis of thefirst leg.

To make possible the use of the driving device of the tongs for tongswith differently constructed tools and counter tools, in which case therod transmitting motion sometimes has to exert pressure and sometimeshas to pull, the legs and the rod are joined by a crankshaft the pin ofwhich is adjustable in such manner that during compression of the legsthe rod exerts either pressure or pull.

The object of the invention, to cause the tool and the counter tool todraw nearer to or away from each other without any motion of the legs ofthe tongs, can be attained in various ways, for example by rendering therod moving the tool displaceable in its axis by relative displace mentof the two legs or parts thereof and fixable in end positions. This canbe effected by a bayonet joint arranged at that end of the leg whichcarries the tool and the counter tool located opposite these tools so asto insure the proper position of the center of gravity of the tongs.

The working axis of the tool and counter tool need not coincide with theaxis of the rod moving these two members. Both axes may for instanceextend parallel to one another.

Another object of the invention is to construct the tongs so that theycan also be motor driven, and for this purpose the second leg of thetongs is articulated to the piston rod of a motor, such as a compressedair motor.

Still another object of the invention is to construct the compressed airmotor in such manner that it is particularly adapted for handling thetongs.

The second way to cause the tool and counter tool to draw nearer to andaway from one another without involving motion of the legs of the tongsconsists in bringing the tool nearer to the counter tool or farther awayfrom it by swinging it about an axis parallel to the working axis,though the arrangement may be such that both the tool and the countertool can be swung about this axis to facilitate the application of thetongs.

It may be stated that tools in accordance with the present invention canbe used in connection with many different types of machines andconstructions as for instance in the construction of airplanes and inthe construction of frameworks of all kinds.

By way of example, three embodiments of the invention are illustrated inthe accompanying drawings, in which Figures 1 to 4 show a construction,wherein the legs of the tongs are manually actuated, the working axisbeing disposed parallel to the axis of the rod moving the tool and boththe tool and the counter tool may be swung about an axis extendingparallel to the working axis and the axis of the rod.

More particularly:

Fig. 1 is a view, partly in section, of the leg portion of the tongs;

Figs. 1b and 1c are cross-sectional views taken on lines Ib-Ib and Ic-Icrespectively of Fig, 1;

Figs. 2 and 3 are cross sections taken on the lines IIII and IIIIII, ofFig. 1; and

Fig. 4 is a side view, partly in section, of the head portion of thetongs;

Figs. 5 to 10 illustrate a modification, in which the tongs are drivenby a compressed air motor.

More particularly:

Fig. 5 is an elevation; Fig. 6, a longitudinal section thereof;

Fig. '7, a cross section taken on the line VIIVII, of Fig. 6, but withthe rotary valve in a difierent position; Fig. 8, a horizontal sectionof a part of Fig. 6 taken on line VIIIVIII thereof, Fig. 9, a horizontalsection of the tongs taken on line IX-IX of Fig. 10; and Fig. 10 an endView of this type of tongs;

Figs. 11 to 15 illustrate a third modification, in which the tool isswingable relative to the counter tool and both tools can be swungrelative to their holder.

More particularly:

Fig. 11 is a section of the head portion of the tongs;

Fig. 12, a view of the rear portion of the tones; Fig. 13, a section ofthe head portion taken on the line XIII--XIII, of Fig. 11;

Fig. 14, a section of the head portion of the tongs on the line XIVXIV,of Fig. 11;

Fig. 15 is a side View of the head portion of this type of tongs.

Figs. 16 and 17 are cross sections of the projection 54, showing thevarious slots.

Referring to the drawings, and first to Figs. 1 to 4, the tongscomprises a substantially tubular leg I at one end of which the tool 2and the counter tool 3 are arranged while to the other end thereof thesecond leg 4 is articulated. The

parts by means of which the second leg 4 is articulated to the first legI are disposed in a fork whose sides 5 are formed of parallel plates andhave circular openings 6 which are closed by the covers 8 secured byscrews I. In the covers 8 a crankshaft is arranged by means of itscrankshaft I3 engaging the crank pin Ill may be subjected to a pull orpressure according to how the squares I I are inserted in the sides E2of the second leg 4. At the end engaging the crank pin II] thecrankshaft I3 is shaped somewhat like a horseshoe, and the pin I0 isembraced by an inserted piece I4 which is connected with the crankshaftby a conical pin I or some other suitable means. The other end of thecrankshaft I8 is articulated to a fork possessing two sides II which aresecured to a cylindrical member I8 forming the shank of the fork andbeing the end of a rod I9 passing through the tubular leg I.

The shank of the fork members 5 is formed by the bayonet sleeve 2|]which is placed over the adjacent end of the leg of the tongs. Thebayonet sleeve hastwo oppositely disposed longitudinal slots 2I and atthe end opposite the fork members 5 is provided with cross slots 22. Inthese slots noses 23 are guided which are arranged on the tubular leg Iat the end thereof opposite the tool and counter tool. The leg I isrotatably disposed in the bayonet sleeve 29, corresponding to thebayonet joint, and over the sleeve 29 an additional sleeve 24 is placedwhich is secured thereto by a screw 25 and in its inner portion has acollar 26, the sleeve 24 being so arranged relative to the sleeve 29that the collar 26 covers the bayonet slots 2| and 22. The collar 26 isprovided with longitudinal slots 21 which are preferably staggered 90relative to the bayonet slots 2I and which are for the purpose ofbringing the sleeve 23 over and beyond the noses 23 on the tube I.

At the end of the leg I opposite the fork 5 a holder 28 is connected bya special means permitting turning of the second leg 4 about the axis ofthe first leg I to an extent of 360. The end of the leg I facing theholder 28 is therefore fitted with a collar 29 and with a connectingbushlike member 30 provided with a thread 3! adjacent to the collar 29.Near the collar 29 the thread 3I is in engagement with a tube 32, alsothreaded at the corresponding end, in which the bushlike member 39 ispositioned as a guide. The

tube 32 serving as handle is disposed on ajcylin- 75 drical projection34 of the holder 28 and at its end has a collar 33 which is adjacent toa collar 35 of the cylindrical projection 34 and is rotatably held by anut 36 screwed upon the threaded collar 35. The rod for moving the toolis subdivided and comprises the members I9 and 31 which at theirabutting ends are provided with collars 38 maintained together by twohalf bushes 39 which in turn are held together by their fitting in thetubular leg I.

In the construction shown, the working axis A--A is staggered relativeto the axis of the rod I9, 31, and the tool 2 and the counter tool 3 arerotatably and fixedly arranged about an axis B-B which is parallel tothe working axis A-A and the axis of the rod I9, 31. For this purposeboth the tool 2 and the counter tool 3 are secured to intermediatemembers 42, 4|, the member 40 carrying the tool 2 being connected withthe motion transmitting rod 31 by a thread 42 and being guided with itsshank 43 in the counter tool carrying member M which is connected withthe holder 28 and has a sleevelike shank 44. Rotation and fixing of thetool and counter tool can be effected by threaded pins 45 coaxiallyarranged on both the tool 2 and the counter tool 3, which are positionedin corresponding bores of the intermediate members 40, 4I and can betightened by nuts 46. The tool 2 is also guided with its shank 4'! in asleevelike shank 48 of the counter tool 3.

The tongs described function as follows:

Owing to the spreading of the legs 4 and I, pressure is brought to bearupon the rod I9 and the rod 31 by means of the crankshaft and the tool 2drawn away from the counter tool 3, so that the mouth of the tongs isopen. During this motion, the left hand embraces the handle 32 and theleg I to prevent relative motion thereof and the right hand embraces thehandle, not shown, of the second leg 4. By slightly turning the leg 4about the axis of the rod I9 the bayonet sleeve 29 connected with thefork 5 is moved to such an extent that the noses 23 emerge from thecross slots 22 and enter the longitudinal slots 2I, whereupon thetubular leg I is inserted in the bayonet sleeve 20 until the noses 23arrive at the end of the sleeve adjacent to the fork members 5. Thecounter tool 3 is thus farther removed from the tool 2, and the tongscan now be applied to the work. To bring the tool 2 and the counter tool3 together again to such an extent that only the distance involvingpressure has to be negotiated the leg I is withdrawn from the sleeve 2|]until the noses 23 can be locked in the cross slots 22 by a slight turnof the bayonet sleeve 20. The actual pressure operation can now begin bythe compression of the legs I and 4. Obviously by giving up thearrangement that the tool and the anvil can be displaced about an axisparallel to the working axis and to the axis of the rod for operatingthe tool, the tool and the anvil take the places of the intermediatemembers 40 and 4i, and are suitably modified at their shaft.

A pair of tongs operated by a compressed air motor is shown inFigs. 5 to10.

To the tubular leg 49 of the tongs a stirrup working head 5I carryingthe counter tool 52 isattached by means of a nut 50. The leg 49 isindirectly connected with the'casing 53 of the compressed air device,and the casing 53 is provided with a cylindrical projection 54 intowhich the bayonet sleeve 59 is screwed by means of the thread 60. Thesleeve 59 has longitudinal slots 58 and cross slots 9| which arestaggered 189 relative to each other. At the end where the leg 49 isintroduced into the cylindrical projection 54 a bush 95 having innerlongitudinal grooves 99 staggered 189 is screwed in in such manner thatthe longitudinal grooves are staggered 90 relative to the longitudinalslots 58 of the bayonet sleeve 59. The bush 55 is held in position by ascrew 51. The tubular leg 49 supports the two noses 92 staggered 180.

This construction also thus affords the possibility of displacing theleg 99 and the counter tool 52 in the direction of the axis of the legand locking them without moving the leg of the tongs. The arrangementcould of course also be such that the tool is moved by means of thebayonet joint without actuation of the leg of the tongs and that thecounter toll remains in unchanged position or that both are moved. Thetool 52, as seen from Fig. is fixedly attached to the tubular leg 49.From Fig. 6, it will be seen that on. the leg 49 there are mounted thebayonet lugs 92, which can be moved in the bayonet slot 98, 9|. Thus bywithdrawing the leg 49 from the sleeve 59, the lugs 62 sliding in thebayonet slot 98, the tool 52 is moved away from the tool I9, and byinserting the lugs 92 in the slot BI, is locked. Similarly the oppositemovement is possible at the end of which the lugs 62 are locked in thetransverse slot 9|.

The cylindrical projection 94 connects with the crankcase which isintegral with the bayonet sleeve 59 and consists of a fork having sidepieces 93 in the form of parallel plates. The side members 93 havecircular and coaxial bores 94 which are closed outside by the covers 65secured by the screws 69. In the covers 95 a crankshaft with coaxialpins 91 is arranged and provided with the crank pin 99 whilst the crankmembers 99 being squares. The connecting rod I9 engaging the crank isdivided in the longitudinal direction, and the two parts are connectedby the screws II. At both ends a fork is formed whose sides are formedalso of parallel plates I2, I3. The sides I3 which engage the crankshafthave coaxial square clearances into which the square crank members 99fit. When the connecting rod I9 is moved, the crankshaft is also turned.The crank pin 99 is joined, at I5 by means of a crank rod I4, to a forkI9 whose shank Ti is connected with a rodlike member I8 by being screwthreaded into the tubular rodlike member I9 which in turn is connectedwith the tool I9.

According to the construction of the tool and counter tool, theperformance of the work to be done by the tongs requires the exertion ofa pull or a pressure upon the rodlike member I9 in the axial directionthereof. This can be easily done by staggering the squares B9 180. Ifthis arrangement is not desired, a crank pin may be inserted between thefork members 13 of the connecting rod I9 and the members may be providedon their outside with coaxially disposed pins.

The connecting rod I9 is at I9 articulated to a piston rod 89 which at8| is articulated to the piston 92 which is of the usual construction.The piston 92 can move in the cylinder 94 formed by the casing 53 andfitted with a liner 93. The compressed air part 95 of the-cylinder 84 issupplied with air by means of a small piston rod 98 firmly connectedwith the piston 82, for instance by a thread 89, and provided with abore 81. At the end of the piston rod 98 0990- site to the piston 92 apiston 89 is secured by a perforated screw 99, which moves in anauxiliary cyllnder 92 having a liner 9I and being arranged in thecontrol casing 93 in such manner that its axis lies in the verticalplane of symmetry of the casings 53 and 93. The return of the piston 92is effected by two piston rods 95 which are preferably symmetricallyarranged relative to the vertical sectional plane of the cylinder 94,surrounded by distance pieces 94 and connected with the piston 82 by thethread 99. At the end of the piston rod 95 opposite the piston 82smaller pistons 91 are secured which move in auxiliary cylinders 99provided with liners 98.

Compressed air is supplied through a hose connection I99 which isscrewed into the control casing 93 by means of a threaded pin I9I. Theconnection I99 has a bore I92 communicating at one end through radialbores I93 with an annular space I94 formed by an annular groove of theconnection I99 and a sleeve I96 drawn over the threaded pin HM and theadjacent end of the connection I99 with an interposed packing I95. Thesleeve I99 forms a collar I91 abutting with an interposed packing I99against the front side of the control casing 93 and is provided asleevelike continuation I99 which serves as a second handle for thetongs and also as a handle for controlling the sleeveIIlIi acting as arotary slide valve. Within the sleeve I99 the connection I99 is providedwith a packing H9 and a stuffing box gland III in the form of a springplate which supports a compression spring II2 also supported by a collarH3 of the connection I99, which closes the bore of the sleeve I99. Thecollar II3 connects with a hexagon nut II 4 for screwing in theconnection.

The rotatable shaft I99 is surrounded by another bushing II5 disposed ina corresponding bore of the control casing 93. From the auxiliarycylinders 92 as well as from the auxiliary cylinders 99 bores IIE, I I!pass through the control casing 93 to the stationary sleeve H5 which, ascontinuations of these bores, is provided with the radial bores H8. Thebores H9, III are preferably so arranged in the casing 93 that the boresIII establishing communication with the auxiliary cylinders 99 open onthe horizontal sectional plane into the sleeve while the bore I I9establishing communication with the auxiliary cylinder 92 opens on thevertical sectional plane into the sleeve H5.

In the controlling member I99 of the rotary slide valve the arrangementis as follows in the position shown in Fig. 6: On a plane extendingvertically to the axis of the sleeve a radial bore H9 is disposed and,staggered 99 in both directions relative thereto, clearances I29 beingprovided on the surface of the sleeve, which extend a distance parallelto the axis of the sleeve. Furthermore, a clearance I2I and radial boresI22 are similarly arranged and staggered at the angle at which therotary slide has to be turned for controlling action, the radial boresI22 being staggered in both directions. The plane mentioned coincideswith the plane on which the radial bores of the sleeve H5 are disposed.At a distance from this plane VIIVII on which the axes of the bores H9and I22 are positioned, in the direction of the side of the casing 93facing the sleeve I99, and lying with their bores on a plane parallel tothe plane VII-VII, bores are provided in the casing 93 and the sleeveII5 thereof, which comprise a bore I23 disposed with its axis in thevertical sectional plane and the bores I24 whose axes lie in thehorizontal sectional plane. The clearances I20 now extend far enoughthat at a corresponding adjustment of the rotary slide valve I06, I99they can connect the bores II1 with the bores I24, and the clearance I2Ihas such an extent that at a corresponding position of the valve it canconnect the bore II6 with the bore I23.

The mode of operation of the rotary slide valve is as follows:

In the position shown in Fig. 6 the compressed air passes through thebore I02, the radial bore I03, the annular space I04, the bores H9, H8and H6, the cylinder 92 and the bore 81 to the pressure side 85 of thecylinder 84, exerts pressure upon the piston 82 and thus drives thepistons 91 into the cylinders 99. The air contained in the cylinders 99escapes through the channels II1, the bores II8, the clearance I20 andthe bores I24.

For returning the piston 92, after rotation of the control sleeve I03,the air, as shown in Fig. 7, passes out of the annular space I04 throughthe bores I22, H8 and H1 into the cylinders 99 where it pushes out thepistons 91 and thus also moves the piston 82. The pressure side 85 ofthe cylinder 84 is emptied by the bore 81 of the piston rod 88, thecylinder 92, the bores II 6 and H8. the clearance I2I and the bore I23.Some bores may be omitted if both cylinders 99 are united by a bore I25.

Tongs, in which the relative displacements of their legs or partsthereof is also to be efiected by compressed air, are preferablyprovided with an auxiliary cylinder that is not in operative connectionwith the main piston 82 and have auxiliary cylinder pistons, the airpassages of which can be controlled by a rotary slide valve whileutilizing the motion of the leg 49 relative to the casing 54.

In the construction according to Figs. 11 to 15 the tool and the countertool can also be drawn nearer to or away from one another without anymotion of the legs of the tongs by providing for relative motion of thetools. The two legs I26 and I21 are articulated to one another, and oneend of the leg I26 has a holder for the tool I28 and the counter toolI29, which comprises a fork having sides I30 formed of parallel discsand having a cylindrical body I3I attached to the side opposite the legI26 a cylindrical body I3I. On the cylindrical body I 3i the shank I32of the tool I28 is provided which is connected with the shank by an armI33, the shank I32 being cylindrical on the outside and having acylindrical clearance on the inside. Over the shank I32 of the tool isplaced the shank I34 of the counter tool I29 which is connected withthis shank by an arm I35. The shank I34 is provided with a cylindricalbore.

In the construction shown the tool I28 is swingably disposed relative tothe counter tool I29, and both tools are movable relative to the holderI30 and particularly its cylindrical projection I3I about the joint axisof the concentric cylinders extending parallel to the working axis A-B.The cylindrical shank I34 of the counter tool I29 has a slot I36 whichis large enough to permit motion of the tool arm I33 within the range ofthe pressure work to be accomplished. This slot I36 is symmetricallyarranged to the surface line of the shank I34 of the counter tool I29nearest to the working axis A--B and extends toward the side oppositethe holder I30 into steps I31 along which the tool arm I33 can move whenthe tool I28 is swung out.

As a feeler for the return of the tool into operative position acylindrical bore I39 extending in radial direction is further providedin the bottom I38 of the shank I34 and accommodates a compression springI40 and a ball I4I which partly enters a channel I 42 disposedvertically to the cylinder axis in the bore of the shank I34.

As shown particularly in Fig. 14, the cylindrical projection I3I at thepoint where it is attached to the fork members I 30 has a collar I44provided with radially arranged teeth I43 which are in adjustableengagement with notches I45 correspondingly arranged in the bore of theshank I34 of the counter tool I29 for jointly stop ping the tool andcounter tool relative to the cylindrical projection I3I of the holderI30.

Fig. 14 shows a small space between the teeth and the notches for thesake of clearness, though the parts actually fit of course into oneanother.

The cylindrical projection I3I of the holder I30, through the bottom I45of which the rod I46 moving the tool I28 passes, has a cylindricalclearance I41 which opens towards the bottom I38 of the tool shank I34and in which a compression spring I48, surrounding the rod I46, isdisposed, which is supported by the bottom I45 of the clearance I41 andalso by the bottom I38 of the tool shank I 34. On the end of the rod I46provided with thread I49 and passing also through the bottom I38 of thetool shaft I32 an adjusting nut I5I is arranged in a clearance I50 ofthe tool for bringing the tool I28 nearer to or away from the countertool, according to the different work pieces to be handled, and forfully utilizing the stroke. The cylindrical clearance I41 preferablycontains a sleeve I52 surrounding the rod I46 for guiding the springI48.

The rod I46 for moving the tool is articulated at I53 to a bell crankI55 articulated between the fork members I30 at I54 and having forkedends I56 and I 51. To the fork I51 another rod I59 is articulated at I58which is guided in the leg I26 of the tongs, which is provided, inaddition to the holder members I30, with a sleeve I60 serving as ahandle. The rod I59 is coupled with a rod I6I which at one end possessesa fork I62 to which at I63 a crank rod I64 is articulated which is alsoarticulated to the crank pin I65 of a crankshaft. The coaxial pins I66of the crankshaft are arranged in the covers I 61 of a forklike casingI68 which with a cylindrical shank I69 is positioned on the end of theleg I26 opposite to the holder I30. The sides of the forklike casing I68are formed of parallel plates having circular openings which are coveredby the members I61 secured by the screws I10. The side pieces of thecrankshaft are formed as squares I1I. The second leg I21 is articulatedto the crankshaft by having its end I12 made into a fork comprising twoparallel plates. These plates are parallel with the covers I61 and havesquare clearances into which the square members I1I of the crankshaftfit.

The arrangement is further such that the leg I21 can be swung 360 aboutthe axis of the rod I59, I69 to facilitate the application of the tongs.For this purpose the rod guided in the leg I26 is divided into the partsI 59 and I5I which at their abutting ends possess the collars I13 andwhich are kept together by a two-part sleeve I14 surrounding the collarswhich are held in position by the leg I26. In view of the fact thatowing to its articulation to the bell crank I55 the rod I59 is notdisplaced exactly in axial direction some play is allowed between theconnecting rod portion and the sleeve I14.

The device shown in Figs. 11 to 15 operates as follows:

In the position shown the tongs are closed. When the legs I26 and I21are spread apart, the tool I28 is drawn away from the counter tool I29and guided in the slot I36 until it emerges therefrom. The tool can thenbe swung so that its arm I33 can be moved along one of the two stepsI31. After introduction of the work, i. e., after application of thetongs, the tool is swung back and can be adjusted by the nut II so as toaccurately rest on the work. Pressure can then be exerted by compressingthe legs.

In the example shown the rod I46 moving the tool is rectangularlypositioned relative to the subdivided rod I59, I M guided in the legI26, though the arrangement may of course be such if desired that therod I46 forming the axis of rotation is positioned at a different angleto the axis of the rod I59, IBI or is coaxial therewith.

The construction shown permits relative motion not only between the tooland counter tool but also between the tools and the holder, wherebyapplication of the tongs can be greatly facilitated. This is effected bydepressing the tool I28 and the counter tool I29 together with theirshanks I32 and I34 against the action of the spring I48 in such mannerthat the teeth I43 come out of engagement with the notches I45,whereupon relative motion to the desired degree is carried out, so thatafter return of the tool and counter tool in upward direction the teethI43 come into engagement again with other notches I45.

I claim:

1. A punching or riveting tool of the kind referred to, comprising apair of jaws, a tubular member at one end of which the jaws aresupported for relative movement, a rod guided within said tubular memberand connected to one of said jaws, a housing movably engaged by theother end of said tubular member, means in said housing for actuatingthe rod to move said jaw relative to the other jaw, and a couplingarranged between said tubular member and said housing and which isdislocatable to permit relative movement of said jaws towards and awayfrom each other independently of the actuation of said rod, said tubularmember and actuating means being manipulatable to engage and disengagesaid coupling and to hold and operate the tool.

2. A tool according to claim 1, in which the coupling includes a sleeveextending from said hous ing and having circumferential and longitudinalbayonet slots therein said sleeve surrounding the end of the tubularmember which is formed with abutments co-operating with the bayonetslots, said tubular member being rotatable within the sleeve to causethe abutments to disengage from the circumferential bayonet slots andenter the longitudinal slots whereby the tubular member may be axiallymoved within the sleeve, and in which a collar is provided closing theopen ends of the bayonet slots so that the tubular member is normallyprevented from being withdrawn from the sleeve by the other.

3. A punching or riveting tool according to claim 1 in which the rodactuating means include a crank journalled in the housing said crankhaving square webs and a crank pin connected to the rod, and a leverpivoted co-axially with the crank in said housing and having squareapertures engaging said square webs whereby said lever can rotate saidcrank.

4. A punching or riveting tool according to claim 1 in which the rodactuating means include a crank journalled in the housing, said crankhaving square webs and a crank pin connected to the rod, and a leverpivoted co-axially with the crank in said housing and having squareapertures engaging said square webs whereby said lever can rotate saidcrank, and in which the rod is formed in two co-axially connected partsof which the part connected to the crank pin is angularly rotatablerelatively to the other part.

5. A punching or riveting tool of the kind referred to, comprising apair of jaws, a tubular member at one end of which the jaws aresupported for relative movement, a rod guided Within said tubular memberand connected to one of said jaws, a housing movably engaged by theother end of said tubular member, means in said housing for actuatingthe rod to move said jaw relative to the other jaw, a coupling arrangedbetween said tubular member and said housing and which is dislocatableto permit relative movement of said jaws towards and away from eachother independently of the actuation of said rod, telescoping shaftscarried by said jaws the common axis of said shafts being parallel toand offset from the axis of the tubular member and said shaft, andco-operating tool members carried by said shafts.

6. A punching or riveting tool of the kind referred to, comprising apair of jaws, a tubular member at one end of which the jaws aresupported for relative movement, a rod guided within said tubular memberandconnected to one of said jaws, a housing movably engaged by the otherend of said tubular member, means in said housing for actuating the rodto move said jaw relative to the other jaw, a coupling arranged betweensaid tubular member and said housing and which is dislocatable to permitrelative movement of said jaws towards and away from each otherindependently of the actuation of said rod, a lever pivoted in saidhousing and arranged to drive the rod actuating means, and a powerdevice acting on the lever said power device being secured to saidhousing.

'7. A punching or riveting tool according to claim 6, in which the powerdevice is an air motor having a hollow piston and piston rod.

8. A punching or riveting tool of the kind rereferred to, comprising apair of jaws, a tubular member at one end of which the jaws aresupported for relative movement, a rod guided within said tubular memberand connected to one of said jaws, a housing movably engaged by theother end of said tubular member, means in said housing for actuatingthe rod to move said jaw relative to the other jaw, a coupling arrangedbetween said tubular member and said housing and which is dislocatableto permit relative movement of said jaws towards and away from eachother independently of the actuation of said rod, a lever pivoted insaid housing and arranged to drive the rod actuating means, a powerdevice acting on the lever said power device including a. plurality ofpistons and cylinders arranged to operate said lever in eitherdirection, and means including a valve to control the operation ofpressure medium in said cylinders.

MAURUS GLAS.

